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A I Lozano - One of the best experts on this subject based on the ideXlab platform.
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total cross section measurements for electron scattering from dichloromethane
Journal of Chemical Physics, 2018Co-Authors: A I Lozano, L Alvarez, F Blanco, M J Brunger, Gustavo GarciaAbstract:Using our magnetically confined electron transmission apparatus, we report the results of total cross sections (TCSs) for electron scattering from dichloromethane (CH2Cl2). The energy range of this study is 1–300 eV. Wherever possible, the present data are compared to earlier measured TCSs of Wan et al. [J. Chem. Phys. 94, 1865 (1991)] and Karwasz et al. [Phys. Rev. A 59, 1341 (1999)] and to the corresponding theoretical independent atom model with screening corrected additivity rule and Interference Term (IAM-SCAR+I) results of Krupa et al. [Phys. Rev. A 97, 042702 (2018)] and a spherical complex optical potential formulation calculation of Naghma et al. [J. Electron Spectrosc. Relat. Phenom. 193, 48 (2014)]. Within their respective uncertainties, the present TCS and those of Karwasz et al. are found to be in very good agreement over their common energy range. However, agreement with the results of Wan et al. is quite poor. The importance of the experimentally inherent ‘missing angle’ effect (see later) on the measured TCS is investigated and found to be significant at the lower energies studied. Indeed, when this effect is accounted for, agreement between our measured TCSs and the corrected IAM-SCAR+I+rotations calculation results are, for energies above about 3 eV, in good accord (to better than 8%). Finally, we observe two σ* shape resonances, consistent with the earlier electron transmission spectroscopy results of Burrow et al. [J. Chem. Phys. 77, 2699 (1982)], at about 2.8 eV and 4.4 eV incident electron energy, in our measured TCS.Using our magnetically confined electron transmission apparatus, we report the results of total cross sections (TCSs) for electron scattering from dichloromethane (CH2Cl2). The energy range of this study is 1–300 eV. Wherever possible, the present data are compared to earlier measured TCSs of Wan et al. [J. Chem. Phys. 94, 1865 (1991)] and Karwasz et al. [Phys. Rev. A 59, 1341 (1999)] and to the corresponding theoretical independent atom model with screening corrected additivity rule and Interference Term (IAM-SCAR+I) results of Krupa et al. [Phys. Rev. A 97, 042702 (2018)] and a spherical complex optical potential formulation calculation of Naghma et al. [J. Electron Spectrosc. Relat. Phenom. 193, 48 (2014)]. Within their respective uncertainties, the present TCS and those of Karwasz et al. are found to be in very good agreement over their common energy range. However, agreement with the results of Wan et al. is quite poor. The importance of the experimentally inherent ‘missing angle’ effect (see later) ...
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total electron scattering cross sections from para benzoquinone in the energy range 1 200 ev
Physical Chemistry Chemical Physics, 2018Co-Authors: A I Lozano, J C Oller, P Limaovieira, D B Jones, R F Da Costa, M Do T N Varella, M H F Bettega, Ferreira F Da Silva, Marco A P LimaAbstract:Total electron scattering cross sections, from para-benzoquinone, for impact energies ranging between 1 to 200 eV, have been obtained by measuring the attenuation of a linear electron beam under magnetic confinement conditions. Random uncertainty limits on these values have been found to be within 5%. Systematic errors, due to the axial magnetic beam conditions in combination with the acceptance angle of the detector, have been evaluated by integrating our calculated independent atom model with the screening corrected additivity rule and Interference Term elastic differential cross sections over that detection acceptance angle. Our previous calculations and measurements on this molecule (Jones et al., J. Chem. Phys., 2018, 148, 124312 and J. Chem. Phys., 2018, 148, 204305), have been compiled and complemented with new elastic and inelastic scattering cross section calculations in order to obtain a comprehensive cross section data base, within the considered energy range, for modelling purposes. The self-consistency of the present data set has been evaluated by simulating the electron transport of 15 eV electrons in para-benzoquinone, and comparing those results with the observed transmitted intensity distribution.
R F Da Costa - One of the best experts on this subject based on the ideXlab platform.
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Total electron scattering cross sections from: Para -benzoquinone in the energy range 1-200 eV
'Royal Society of Chemistry (RSC)', 2020Co-Authors: Lozano Ana., R F Da Costa, Ferreira Da Silva, F., Oller J. C., Jones D. B., Bettega M. H. F., Limao-vieira P., Lima M. A. P., Varella M. T. D. N., White R. D.Abstract:11 pags., 6 figs., 3 tabs.Total electron scattering cross sections, from para-benzoquinone, for impact energies ranging between 1 to 200 eV, have been obtained by measuring the attenuation of a linear electron beam under magnetic confinement conditions. Random uncertainty limits on these values have been found to be within 5%. Systematic errors, due to the axial magnetic beam conditions in combination with the acceptance angle of the detector, have been evaluated by integrating our calculated independent atom model with the screening corrected additivity rule and Interference Term elastic differential cross sections over that detection acceptance angle. Our previous calculations and measurements on this molecule (Jones et al., J. Chem. Phys., 2018, 148, 124312 and J. Chem. Phys., 2018, 148, 204305), have been compiled and complemented with new elastic and inelastic scattering cross section calculations in order to obtain a comprehensive cross section data base, within the considered energy range, for modelling purposes. The self-consistency of the present data set has been evaluated by simulating the electron transport of 15 eV electrons in para-benzoquinone, and comparing those results with the observed transmitted intensity distribution.This study has partially been supported by the Spanish Ministry MINECO (Project FIS-80440). F. F. S. acknowledges the Portuguese National Funding Agency FCT through Researcher Contract No. IF-FCT IF/00380/2014, and, together with P. L. V., the Research Grant No. UID/FIS/00068/2013. M. J. B. thanks the Australian Research Council for funding through grants DP160102787 and DP180101655. Finally, M. A. P. L., M. T. N. V. (Grant I. D. 305672/2014-9), R. F. C. (Grant I. D. 313094/2017-9) and M. H. F. B. all acknowledge financial support from the Brazilian agency Conselho Nacional de Desenvolvimento Cientı´fico e Tecnolo´gico (CNPq). These authors also wish to thank computational support from Centro de Computaçao John David Rogers (CCJDR) at Universidade Estadual de Campinas (UNICAMP). Finally, M. T. N. V. acknowledge Fundaça˜o de Amparo a` Pesquisa do Estado de Sa˜o Paulo (FAPESP) (Grant I. D. 2017/24145-9) for funding
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Total electron scattering cross sections from para-benzoquinone in the energy range 1-200 eV
Reino Unido, 2020Co-Authors: Lozano A., R F Da Costa, Ferreira F Da Silva, Oller J. C., Jones D. B., Varella, Do M. T. N., Bettega M. H. F., Limao-vieira P., Lima M. A. P., White R. D.Abstract:CNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOTotal electron scattering cross sections, from para-benzoquinone, for impact energies ranging between 1 to 200 eV, have been obtained by measuring the attenuation of a linear electron beam under magnetic confinement conditions. Random uncertainty limits on these values have been found to be within 5%. Systematic errors, due to the axial magnetic beam conditions in combination with the acceptance angle of the detector, have been evaluated by integrating our calculated independent atom model with the screening corrected additivity rule and Interference Term elastic differential cross sections over that detection acceptance angle. Our previous calculations and measurements on this molecule (Jones et al., J. Chem. Phys., 2018, 148, 124312 and J. Chem. Phys., 2018, 148, 204305), have been compiled and complemented with new elastic and inelastic scattering cross section calculations in order to obtain a comprehensive cross section data base, within the considered energy range, for modelling purposes. The self-consistency of the present data set has been evaluated by simulating the electron transport of 15 eV electrons in para-benzoquinone, and comparing those results with the observed transmitted intensity distribution.20342236822378CNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOCNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO305672/2014-9313094/2017-92017/24145-9Agências de fomento estrangeiras apoiaram essa pesquisa, mais informações acesse artig
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total electron scattering cross sections from para benzoquinone in the energy range 1 200 ev
Physical Chemistry Chemical Physics, 2018Co-Authors: A I Lozano, J C Oller, P Limaovieira, D B Jones, R F Da Costa, M Do T N Varella, M H F Bettega, Ferreira F Da Silva, Marco A P LimaAbstract:Total electron scattering cross sections, from para-benzoquinone, for impact energies ranging between 1 to 200 eV, have been obtained by measuring the attenuation of a linear electron beam under magnetic confinement conditions. Random uncertainty limits on these values have been found to be within 5%. Systematic errors, due to the axial magnetic beam conditions in combination with the acceptance angle of the detector, have been evaluated by integrating our calculated independent atom model with the screening corrected additivity rule and Interference Term elastic differential cross sections over that detection acceptance angle. Our previous calculations and measurements on this molecule (Jones et al., J. Chem. Phys., 2018, 148, 124312 and J. Chem. Phys., 2018, 148, 204305), have been compiled and complemented with new elastic and inelastic scattering cross section calculations in order to obtain a comprehensive cross section data base, within the considered energy range, for modelling purposes. The self-consistency of the present data set has been evaluated by simulating the electron transport of 15 eV electrons in para-benzoquinone, and comparing those results with the observed transmitted intensity distribution.
Marco A P Lima - One of the best experts on this subject based on the ideXlab platform.
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total electron scattering cross sections from para benzoquinone in the energy range 1 200 ev
Physical Chemistry Chemical Physics, 2018Co-Authors: A I Lozano, J C Oller, P Limaovieira, D B Jones, R F Da Costa, M Do T N Varella, M H F Bettega, Ferreira F Da Silva, Marco A P LimaAbstract:Total electron scattering cross sections, from para-benzoquinone, for impact energies ranging between 1 to 200 eV, have been obtained by measuring the attenuation of a linear electron beam under magnetic confinement conditions. Random uncertainty limits on these values have been found to be within 5%. Systematic errors, due to the axial magnetic beam conditions in combination with the acceptance angle of the detector, have been evaluated by integrating our calculated independent atom model with the screening corrected additivity rule and Interference Term elastic differential cross sections over that detection acceptance angle. Our previous calculations and measurements on this molecule (Jones et al., J. Chem. Phys., 2018, 148, 124312 and J. Chem. Phys., 2018, 148, 204305), have been compiled and complemented with new elastic and inelastic scattering cross section calculations in order to obtain a comprehensive cross section data base, within the considered energy range, for modelling purposes. The self-consistency of the present data set has been evaluated by simulating the electron transport of 15 eV electrons in para-benzoquinone, and comparing those results with the observed transmitted intensity distribution.
K. Schönwald - One of the best experts on this subject based on the ideXlab platform.
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the o α 2 initial state qed corrections to e e annihilation to a neutral vector boson revisited
Physics Letters B, 2019Co-Authors: J. Blümlein, A. De Freitas, C.g. Raab, K. SchönwaldAbstract:Abstract We calculate the non-singlet, the pure singlet contribution, and their Interference Term, at O ( α 2 ) due to electron-pair initial state radiation to e + e − annihilation into a neutral vector boson in a direct analytic computation without any approximation. The correction is represented in Terms of iterated incomplete elliptic integrals. Performing the limit s ≫ m e 2 we find discrepancies with the earlier results of Ref. [1] and confirm results obtained in Ref. [2] where the effective method of massive operator matrix elements has been used, which works for all but the power corrections in m 2 / s . In this way, we also confirm the validity of the factorization of massive partons in the Drell–Yan process. We also add non-logarithmic Terms at O ( α 2 ) which have not been considered in [1] . The corrections are of central importance for precision analyses in e + e − annihilation into γ ⁎ / Z ⁎ at high luminosity.
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The O(α2) initial state QED corrections to e+e− annihilation to a neutral vector boson revisited
Elsevier, 2019Co-Authors: J. Blümlein, A. De Freitas, C.g. Raab, K. SchönwaldAbstract:We calculate the non-singlet, the pure singlet contribution, and their Interference Term, at O(α2) due to electron-pair initial state radiation to e+e− annihilation into a neutral vector boson in a direct analytic computation without any approximation. The correction is represented in Terms of iterated incomplete elliptic integrals. Performing the limit s≫me2 we find discrepancies with the earlier results of Ref. [1] and confirm results obtained in Ref. [2] where the effective method of massive operator matrix elements has been used, which works for all but the power corrections in m2/s. In this way, we also confirm the validity of the factorization of massive partons in the Drell–Yan process. We also add non-logarithmic Terms at O(α2) which have not been considered in [1]. The corrections are of central importance for precision analyses in e+e− annihilation into γ⁎/Z⁎ at high luminosity. Keywords: Higher order QED correction, e+e− annihilation, Precision physics at ILC, FCC, Iterated integral
Ferreira F Da Silva - One of the best experts on this subject based on the ideXlab platform.
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Total electron scattering cross sections from para-benzoquinone in the energy range 1-200 eV
Reino Unido, 2020Co-Authors: Lozano A., R F Da Costa, Ferreira F Da Silva, Oller J. C., Jones D. B., Varella, Do M. T. N., Bettega M. H. F., Limao-vieira P., Lima M. A. P., White R. D.Abstract:CNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOTotal electron scattering cross sections, from para-benzoquinone, for impact energies ranging between 1 to 200 eV, have been obtained by measuring the attenuation of a linear electron beam under magnetic confinement conditions. Random uncertainty limits on these values have been found to be within 5%. Systematic errors, due to the axial magnetic beam conditions in combination with the acceptance angle of the detector, have been evaluated by integrating our calculated independent atom model with the screening corrected additivity rule and Interference Term elastic differential cross sections over that detection acceptance angle. Our previous calculations and measurements on this molecule (Jones et al., J. Chem. Phys., 2018, 148, 124312 and J. Chem. Phys., 2018, 148, 204305), have been compiled and complemented with new elastic and inelastic scattering cross section calculations in order to obtain a comprehensive cross section data base, within the considered energy range, for modelling purposes. The self-consistency of the present data set has been evaluated by simulating the electron transport of 15 eV electrons in para-benzoquinone, and comparing those results with the observed transmitted intensity distribution.20342236822378CNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOCNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO305672/2014-9313094/2017-92017/24145-9Agências de fomento estrangeiras apoiaram essa pesquisa, mais informações acesse artig
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total electron scattering cross sections from para benzoquinone in the energy range 1 200 ev
Physical Chemistry Chemical Physics, 2018Co-Authors: A I Lozano, J C Oller, P Limaovieira, D B Jones, R F Da Costa, M Do T N Varella, M H F Bettega, Ferreira F Da Silva, Marco A P LimaAbstract:Total electron scattering cross sections, from para-benzoquinone, for impact energies ranging between 1 to 200 eV, have been obtained by measuring the attenuation of a linear electron beam under magnetic confinement conditions. Random uncertainty limits on these values have been found to be within 5%. Systematic errors, due to the axial magnetic beam conditions in combination with the acceptance angle of the detector, have been evaluated by integrating our calculated independent atom model with the screening corrected additivity rule and Interference Term elastic differential cross sections over that detection acceptance angle. Our previous calculations and measurements on this molecule (Jones et al., J. Chem. Phys., 2018, 148, 124312 and J. Chem. Phys., 2018, 148, 204305), have been compiled and complemented with new elastic and inelastic scattering cross section calculations in order to obtain a comprehensive cross section data base, within the considered energy range, for modelling purposes. The self-consistency of the present data set has been evaluated by simulating the electron transport of 15 eV electrons in para-benzoquinone, and comparing those results with the observed transmitted intensity distribution.
